Question: Did you just install a new CPU, and is it causing Windows to boot only in Legacy mode?

F5F Stay Refreshed Hardware Desktop Question: Did you just install a new CPU, and is it causing Windows to boot only in Legacy mode?

Question: Did you just install a new CPU, and is it causing Windows to boot only in Legacy mode?

Question: Did you just install a new CPU, and is it causing Windows to boot only in Legacy mode?

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dianarose32129
Senior Member

570

11-15-2020, 12:32 AM

#1

I changed my CPU to a Ryzen 5 5600X after updating the BIOS. But after that, I couldn't reach the BIOS main screen and Windows wouldn't boot. Switching from UEFI to CMS worked, but now Windows takes a long time to start, and I'm not sure about how well apps perform. I have limited knowledge of these settings. Are there any downsides to using CMS permanently besides slower boot times? What might be causing the UEFI mode issue?

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dianarose32129

11-15-2020, 12:32 AM #1

I changed my CPU to a Ryzen 5 5600X after updating the BIOS. But after that, I couldn't reach the BIOS main screen and Windows wouldn't boot. Switching from UEFI to CMS worked, but now Windows takes a long time to start, and I'm not sure about how well apps perform. I have limited knowledge of these settings. Are there any downsides to using CMS permanently besides slower boot times? What might be causing the UEFI mode issue?

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FatihTerim
Member

184

11-16-2020, 01:31 PM

#2

Hello there! Are you using a specific motherboard? Have you reset the CMOS after confirming the BIOS update was applied correctly?

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FatihTerim

11-16-2020, 01:31 PM #2

Hello there! Are you using a specific motherboard? Have you reset the CMOS after confirming the BIOS update was applied correctly?

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MisterN3A3TKG
Member

54

11-16-2020, 01:43 PM

#3

MSI B350M Bazooka.
I didn't reset CMOS specifically, but I attempted "Restore default settings" in the BIOS after installing the new CPU. It only changed UEFI mode as the default boot option, and then I needed to revert it back to CMS to get Windows to start properly.

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MisterN3A3TKG

11-16-2020, 01:43 PM #3

MSI B350M Bazooka.
I didn't reset CMOS specifically, but I attempted "Restore default settings" in the BIOS after installing the new CPU. It only changed UEFI mode as the default boot option, and then I needed to revert it back to CMS to get Windows to start properly.

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jonttutonttu1
Member

214

11-17-2020, 08:58 PM

#4

Show a screenshot from Disk Management. (Upload to imgur.com and share the link)
If your system doesn't start in UEFI-only mode, it means it was installed in legacy mode. You haven't booted in UEFI before. The use of CSM is necessary for legacy mode.

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jonttutonttu1

11-17-2020, 08:58 PM #4

Show a screenshot from Disk Management. (Upload to imgur.com and share the link)
If your system doesn't start in UEFI-only mode, it means it was installed in legacy mode. You haven't booted in UEFI before. The use of CSM is necessary for legacy mode.

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JoshuaMca
Junior Member

34

11-17-2020, 11:22 PM

#5

I learned more about CMS and noticed it might only slightly influence system speed, aside from extending boot duration. But isn't it a 32-bit environment? Doesn't this impact overall performance? The Windows startup time rose noticeably, indicating UEFI was likely the primary mode before.

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JoshuaMca

11-17-2020, 11:22 PM #5

I learned more about CMS and noticed it might only slightly influence system speed, aside from extending boot duration. But isn't it a 32-bit environment? Doesn't this impact overall performance? The Windows startup time rose noticeably, indicating UEFI was likely the primary mode before.

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WhatsThePack
Member

215

11-18-2020, 12:28 AM

#6

It doesn't influence performance and isn't related to 32bit or 64bit architecture. It will disable secure boot, and it's a CSM module, not CMS.

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WhatsThePack

11-18-2020, 12:28 AM #6

It doesn't influence performance and isn't related to 32bit or 64bit architecture. It will disable secure boot, and it's a CSM module, not CMS.

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DURELL
Junior Member

27

11-22-2020, 05:16 AM

#7

I should have been more explicit; the system automatically displays the BIOS main screen and doesn't initiate the Windows boot without CSM.
Is there any disadvantage to continuing to use CSM? Updating the CPU was only a short-term fix, and I plan to assemble a new PC after a few years. I wouldn't mind avoiding another reinstall of Windows and all the programs.

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DURELL

11-22-2020, 05:16 AM #7

I should have been more explicit; the system automatically displays the BIOS main screen and doesn't initiate the Windows boot without CSM.
Is there any disadvantage to continuing to use CSM? Updating the CPU was only a short-term fix, and I plan to assemble a new PC after a few years. I wouldn't mind avoiding another reinstall of Windows and all the programs.

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Rob19
Junior Member

3

11-22-2020, 07:03 AM

#8

The request remains unchanged.

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Rob19

11-22-2020, 07:03 AM #8

The request remains unchanged.

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Zercuador
Member

163

11-27-2020, 08:52 PM

#9

I value your assistance, but I feel it no longer adds value since the system is functioning well. Still, if anyone knows about possible issues CSM could introduce in the future, please inform me. Thank you!

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Zercuador

11-27-2020, 08:52 PM #9

I value your assistance, but I feel it no longer adds value since the system is functioning well. Still, if anyone knows about possible issues CSM could introduce in the future, please inform me. Thank you!

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BattleVaces
Member

228

11-27-2020, 10:44 PM

#10

Goal is to check whether the system is starting in legacy mode or UEFI mode.
No proof of either has been shown.
If you're currently running in UEFI mode, this conversation isn't necessary.

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BattleVaces

11-27-2020, 10:44 PM #10

Goal is to check whether the system is starting in legacy mode or UEFI mode.
No proof of either has been shown.
If you're currently running in UEFI mode, this conversation isn't necessary.

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